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Primary Production01:06

Primary Production

The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
Key Elements for Plant Nutrition02:35

Key Elements for Plant Nutrition

Like all living organisms, plants require organic and inorganic nutrients to survive, reproduce, grow and maintain homeostasis. To identify nutrients that are essential for plant functioning, researchers have leveraged a technique called hydroponics. In hydroponic culture systems, plants are grown—without soil—in water-based solutions containing nutrients. At least 17 nutrients have been identified as essential elements required by plants. Plants acquire these elements from the atmosphere, the...
Diagnosing Acidosis and Alkalosis01:24

Diagnosing Acidosis and Alkalosis

Diagnosing acid-base imbalances involves systematically analyzing arterial blood samples, focusing on three key measurements: pH, bicarbonate (HCO3−) concentration, and carbon dioxide partial pressure (PCO2). This analysis follows a four-step process that helps identify the imbalance's underlying cause and nature.
First, the pH level is assessed to determine whether the blood pH is normal (7.35–7.45), low (acidosis), or high (alkalosis).
Next, the PCO2  and HCO3−  values are examined to...
Testing Water Quality01:14

Testing Water Quality

When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...
Oxygen Requirements and Growth Patterns01:29

Oxygen Requirements and Growth Patterns

Microorganisms exhibit diverse oxygen requirements and growth patterns driven by their metabolic strategies and environmental adaptations. Oxygen, while essential for many organisms, can also be toxic under certain conditions, shaping how microorganisms grow and survive.Oxygen Requirements of MicroorganismsMicroorganisms are classified based on their ability to use or tolerate oxygen:● Obligate aerobes like Mycobacterium tuberculosis need oxygen for energy production, as it serves as the...
Marine Microbial Ecology01:30

Marine Microbial Ecology

Marine microbial ecosystems are shaped by distinct physicochemical limits, including high salinity, low nutrient availability, and fluctuating oxygen levels. These conditions favor smaller microbial cell sizes, which maximize their surface-to-volume ratio for efficient nutrient uptake.Microbial activity and community composition are closely linked to biogeochemical cycles, particularly in dynamic environments like estuaries, where halotolerant microbes thrive in response to variable salinity...

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Related Experiment Video

Updated: Jun 30, 2026

Unraveling the Unseen Players in the Ocean - A Field Guide to Water Chemistry and Marine Microbiology
10:43

Unraveling the Unseen Players in the Ocean - A Field Guide to Water Chemistry and Marine Microbiology

Published on: November 5, 2014

Diagnosing oceanic nutrient deficiency.

C Mark Moore1

  • 1Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, European Way, Southampton SO14 3ZH, UK cmm297@noc.soton.ac.uk.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|October 17, 2017
PubMed
Summary
This summary is machine-generated.

Ocean nutrient deficiencies, including trace elements, are key to understanding oceanic production. Global datasets reveal large-scale patterns in nutrient limitation, impacting marine ecosystems and carbon cycling.

Keywords:
nutrientsocean biogeochemistrytrace metals

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Visualization of Productivity Zones Based on Nitrogen Mass Balance Model in Narragansett Bay, Rhode Island

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Visualization of Productivity Zones Based on Nitrogen Mass Balance Model in Narragansett Bay, Rhode Island
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Visualization of Productivity Zones Based on Nitrogen Mass Balance Model in Narragansett Bay, Rhode Island

Published on: July 14, 2023

Area of Science:

  • Marine Biogeochemistry
  • Oceanography
  • Chemical Oceanography

Background:

  • Nutrient supply to surface waters drives oceanic production and biogeochemical cycles.
  • Nutrient deficiencies indicate potential limitations on new organic matter production in the upper ocean.
  • Understanding nutrient stoichiometry is crucial for marine ecosystem dynamics.

Purpose of the Study:

  • To assess multi-element nutrient deficiencies at a global scale using comprehensive datasets.
  • To link diagnosed nutrient deficiency patterns to physical, chemical, and biological ocean processes.
  • To investigate uncertainties in nutrient ratios and their implications for upper ocean limitation.

Main Methods:

  • Utilized high-quality, full-depth global datasets from the GEOTRACES program.
  • Analyzed concentrations of a wide range of macro- and micro-nutrients.
  • Calculated and ranked deficiencies across multiple elements.

Main Results:

  • Identified coherent large-scale patterns in multi-element nutrient deficiencies.
  • Linked these patterns to interacting physical-chemical-biological drivers of ocean biogeochemistry.
  • Highlighted uncertainties in microbial stoichiometric plasticity and nutrient limitation linkages.

Conclusions:

  • Global nutrient deficiency patterns provide insights into upper ocean biogeochemistry.
  • GEOTRACES data enables unprecedented scale analysis of nutrient limitations.
  • Further research is needed on nutrient ratio plasticity and its impact on primary production.